Tuesday, 15 April 2008


California Bearing Ratio or CBR is a soil parameter that is very important in road design.

Roads are normally designed in accordance to their category or traffic loading. The first 3 componets of which do not change a lot, i.e. in terms of thickness and grade but the sub-base and the capping layer are dependant on the soil CBR.

Below is a typical tarmac access road construction and a table for sub-base and capping layer with respect to CBR percentage. (just double click to see an enlarged version)

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